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- W2057788573 abstract "Most fungiform taste buds fail to become innervated when BDNF or NT4 is overexpressed in the basal layer of tongue epithelium. Here, we examined when and how overexpression of BDNF and NT4 disrupt innervation to fungiform papillae. Overexpression of either factor disrupted chorda tympani innervation patterns either before or during the initial innervation of fungiform papillae. NT4 and BDNF overexpression each disrupted initial innervation by producing different gustatory axon morphologies that emerge at distinct times (E12.5 and E14.5, respectively). Chorda tympani nerve branching was reduced in NT4 overexpressing mice, and neuronal fibers in these mice were fasciculated and remained below the epithelial surface, as if repelled by NT4 overexpression. In contrast, many chorda tympani nerve branches were observed near the epithelial surface in mice overexpressing BDNF, and most were attracted to and invaded non-taste filiform papillae instead of gustatory papillae. These results suggest that BDNF, but not NT4, normally functions as a chemoattractant that allows chorda tympani fibers to distinguish their fungiform papillae targets from non-gustatory epithelium. Since BDNF and NT4 both signal through the p75 and TrkB receptors, trophin-specific activation of different internal signaling pathways must regulate the development of the distinct gustatory axon morphologies in neurotrophin-overexpressing mice." @default.
- W2057788573 created "2016-06-24" @default.
- W2057788573 creator A5007386335 @default.
- W2057788573 creator A5076368423 @default.
- W2057788573 date "2006-04-01" @default.
- W2057788573 modified "2023-10-17" @default.
- W2057788573 title "Epithelial overexpression of BDNF and NT4 produces distinct gustatory axon morphologies that disrupt initial targeting" @default.
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- W2057788573 doi "https://doi.org/10.1016/j.ydbio.2006.01.021" @default.
- W2057788573 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1939808" @default.
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